Everybody knows that actress Kristen Bell loves sloths but viewers of Tuesday's "The Ellen DeGeneres Show" were in for a surprise, as they saw the video of the actress, crying on seeing a sloth.

Kristen Bell
Kristen Bell crying on her 31st birthday.

She revealed in Ellen's show that she cried when her fiance Dax Shepard present a sloth on her 31st birthday last July.

"The day of my birthday, we're sitting in the living room and I hear a knock at the door. He says, 'Your present is here... I had no context for knowing what it was, but I grabbed the dogs and walk into the back room of the house and I was immediately overcome and I thought, 'There's a sloth near,'" Bell told host Ellen DeGeneres.

"I didn't know how to process that... my entire life had been leading to that moment. I start to have a full-fledged panic attack. I don't know how to compete with all this emotion, so I crawl on the bed and I'm crying so hard," she added.

Shepard, star of NBC's Parenthood, made Bell's birthday special by arranging for a sloth to attend her birthday party.

Kristen Bell went emotional again on the show when Ellen suggested her that a sloth is waiting backstage.

The actress earlier said that she has been obsessed with sloths for as long as she could remember.

Video of Kristen Bell on "The Ellen DeGeneres Show"